Hydraulic system of construction machinery
A technology for hydraulic systems and construction machinery, applied in the field of hydraulic systems, can solve problems such as problems in the control unit, excessive operating oil of the travel motor, and overspeed driving, so as to prevent low durability, ensure driving stability, and prevent driving overspeed. Effect
Active Publication Date: 2016-12-07
현대두산인프라코어주
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Problems solved by technology
However, in the hydraulic system of the conventional construction machinery, for unknown reasons, problems occur in the control part that controls by means of the current signal.
If a problem occurs in the control section, the control of the first main pump will be abnormal
In particular, if the hydraulic oil discharged from the first main pump merges with the hydraulic oil discharged from the second main pump, the hydraulic oil supplied to the travel motor will be excessive.
That is, there is a possibility of overspeeding compared with the traveling speed designed by the manufacturer of the construction machine, and there is a problem that traveling stability is impaired.
In addition, if the operating oil is excessively supplied to the travel motor, there will be a problem in the durability of the travel system
Method used
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[0040] The advantages and features of the present invention, as well as a method for achieving the same, will become apparent with reference to the accompanying drawings and the embodiments described in detail later.
[0041] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below are exemplified to facilitate understanding of the present invention, and it should be understood that the present invention can be implemented with various modifications different from the embodiments described herein. However, in the process of describing the present invention, when it is judged that the specific description of the related well-known functions or constituent elements may obscure the gist of the present invention, the detailed description and the specific illustration are omitted. In addition, in order to help the understanding of invention, an accompanying drawing is not shown on an actu...
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The invention relates to a hydraulic system of construction machinery. When the hydraulic system of the construction machine according to the embodiment of the present invention is in the running mode, the working oil discharged from the first main pump is merged with the working oil discharged from the second main pump, and the combined working oil is supplied to the traveling motor to make the driving Improved performance. In addition, even if the first and third control valve units (51, 53) cannot be correctly controlled due to unknown reasons in the hydraulic system of the construction machine in the embodiment of the present invention, when it is in the driving mode, the first main pump is limited. The maximum discharge flow rate can prevent driving overspeed, so driving stability can be ensured, and durability of the driving system can be prevented from being reduced.
Description
technical field [0001] The invention relates to a hydraulic system of construction machinery. More specifically, it relates to a hydraulic system including a first main pump and a second main pump, in which hydraulic oil discharged from the first main pump merges with hydraulic oil discharged from the second main pump in a running mode. , the confluent working oil is supplied to the travel motor, so that the travel performance can be improved to the hydraulic system of the construction machinery. Background technique [0002] Generally speaking, construction machinery has a power source and a hydraulic system. The power source can be an engine or an electric motor. The hydraulic system may include the main pump, main control valve, actuators, auxiliary pumps and joysticks. [0003] The main pump is operated by the power source, and discharges the hydraulic oil under pressure. There can be more than one main pump. In addition, the main pump may be a variable displacement...
Claims
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IPC IPC(8): F15B11/04
CPCF15B11/04E02F9/2239E02F9/2253E02F9/226E02F9/2285E02F9/2292
Inventor 孙元旋孙东渊金因东
Owner 현대두산인프라코어주